A Dagger

The person that had caught Alex followed him the moment he sensed him running away. He sped up, trying to catch up to Alex, but he couldn't exactly catch up.

Alex flew in a random direction, with his spiritual sense constantly shifting through the debris around him, paying attention to everything since any of those could be another human. He couldn't miss them. 

At the same time, he was also looking for anything that could help him stay in the secret realm for a bit longer. 

At first, he panicked due to the sudden arrival of a threat, but once he started running away, he realized that the threat wasn't as big of a threat as he might have expected it to be.

To his relief, the person following him wasn't strong at all. If they were strong, they would have already caught up to him with the speed he was flying at.